Update YafaRay website in projects list

The .org domain isn't owned by the team anymore.
See YafaRay/libYafaRay#2

Author: tbertels

web/index.md

@@ -139,7 +139,7 @@ forward. Contributions have been going to and coming from these projects:
 - [VSXu](https://www.vsxu.com/)
 - [Woo](https://www.woodem.eu/)
 - [wxWidgets](https://www.wxwidgets.org/)
-- [YafaRay](https://www.yafaray.org/)
+- [YafaRay](https://github.com/YafaRay/libYafaRay)
 - [zlib](https://www.zlib.net/)
 
 *Feel free to add your project to this list!*